Question $4(6\mathrm{.}67$ points$)$

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Ch$18$ Total Internal Reflection: The critical angle for a substance in air is measured at $42\mathrm{.}0.$ If light enters this substance from air at $65\mathrm{.}0$ with the normal, at what angle with the normal will it continue to travel?

$53$

It will not continue, but will be totally reflected.

$28$

$37$